jacobus



Feb. 3 1931. D JACQBUS I 1,790,817

AIR HEATER 2 Sheets-Sheet 1 Filed Oct. l, 1927 0 0 0 0 a 0 v 0 0 0 0 0 0 W lNv ENToR BY 2 ATTORN EYS Feb 3, 1931. D. s. JACOBUS 1,790,817 Am HEATER Filed 0ct. 19.1927

2 Sheets$heet 2 M ATTORNEYS Z a: Y IN\VTOR I BY WM Patented Feb. 3, 1931 UNITED STATES PATENT OFFICE DAVID s. JACOBUS, or IMONTOLAIR, NEW JERSEY, ASSIGNOIR, TO THE BAZBCOCK & wILcox COMPANY, or BAYONNE, NEW JERSEY, A CORPORATION or NEW JERSEY AIR HEATER Application filed October 19, 1927.. Serial No..227,079.

This invention relates edit. device by which heat can be exchanged between'two fluids without causing the fluids to mix with each other, and will be understood. from the description in connection with'the accompanying drawings in which Fig; 1 is a vertical section through an illustrative embodiment of the invention; Fig. 2 is ahorizontal section along the line '2'2 of Fig. 1; Fig. 3 is a section on an enlarged scale showing some of the details; Fig. 4 is a view along the line 4.t of Fig. 3; Fig. 5 is a section along the line 55 of Fig. 4; Fig. 6 is a section along the line 66 of Fig. 3; Fig. 7 is a section along the line 77 of Fig. 3; Fig. 8 is a section on an enlarged scale similar to Fig. 2 partly broken away; and Fig. 9 is a similar section through a modification.

outside of the tubes.

In the drawing reference character. 1 indicates the casing of the heater thatis provided with tube sheets 2 and 3 at opposite ends and on opposite sides thereof. The tube sheets 2 and 3 may be lined on the inside as, shown at 2 and 3. A fluid inlet at is provided at one end opposite the tube sheet 2 and an opening 5 is provided at the other end opposite tube sheet 3. Staggered rows of tubes 6 extend longitudinally through the casing 1 and their ends are bent, as shown at and 8, so that the tubes enter the tube sheets 2 and perpendicularly thereto. of successive tubes vary in length and the points of the successive tubes where the bends begin are inclined across the heater. The bent ends of the tubes are flattened transversely of the heater so as to decrease the resistance to the passage of the fluid along the The bends of the tubes are such that their ends are farther apart a than the intermediate portions as most clearly shown in Figs. 3, 4 and 8.

In order to hold the tubes in alignment, transverse corrugated strips or bars 9 are located in the lanes between the rows of tubes,

# as shown in Fig. 1 and Fig. 2. Where the tubes are vertical, as shown, the spacing strips 9 are preferably placed in horizontal rows with each spacing strip between several rows of tubes, say four, as shown in Fig. 2. When this is done the spacing strips are The bent portions placed in several horizontalrows near each alignment, The strips which come in the adjacent rows beneath the stiips '9 in Fig. 2 would be in the'position of the dotted lines marked 9a in Fig. 2. This arrangement aflords a lesser resistance to the flow of the fluid than would be the case if the spacing strips were placed in a single horizontal row between each row of tubes, whereas all of the tubes are held in alignment as effectively by one arrangement as by the other. The bars or strips may be supported on the tubes or anchored to the side of the casing 1 if desired.

In the modification shown in Fig. 9, in addition to the corrugated strips or bars 9 extending across the chamber between certain of the rows of tubes, sets of diagonal bars 10 and 11 cross each other and are located in the diagonal lanes and contact with the sides of the tubes 6, thus keeping them-in alignment. The diagonal bars may be used withcgit the corrugated strips or supporting bars 9 in which case the diagonal bars would be supported on the tubes or on the casing.

In the operation ofthis device where heat is transferred from hot flue gases to air, which air may be used for combustion purposes, the hot gases may be caused to enter the opening 4: and pass downwardly along the outside of the tubes and pass out through the opening '5. The air to be heated would then enter the the invention.

I claim:

1. In a heat exchange device, a casing,

'circular tubes in said casing, the ends of said tubes being bent and flattened. I

2. In a heat exchange device, a casing, circular tubes in said casing, the ends of said tubes being bent and flattened, and tube sheets near the op osite ends of said casing into which said tu es enter.

3. In a heat exchange device, a casing, circular tubes in said casing, the ends of said tubes being bent and flattened, and tube are spaced farther apart than the intermediate portions.

6. In a heat exchange device, a casing, circular tubes in said casing, the ends of said tubes being bent and flattened, and gas inlet and outlet openings in said casing opposite the convex portions of'said tubes.

7 In a heat exchange device, a casing, circular tubes in said casing, the ends of said tubes being bent in opposite directions and flattened. p

8. he heat exchange device, a casing, rows of tubes in said casing and bars extending through lanes between said tubes and in contact with them.

9. 1m a heat exchange device, a casing, rows of tubes in said casing and corrugated bars extending through lanes between saidtubes I and in contact with them:

10. In a heat exchange device, a casing, rows of tubes in said casing and bars extending through lanes between said tubes and inv contact with them, said bars being spaced longitudinally of said tubes.

11. In a heat exchange device, a casin rows of tubes in said casing and bars exten ing through lanes between said tubes and in contact with them, said bars being located in difierent lanes at various points longitudinally of said tubes.

12. In a heat exchange device, a casing, rows of tubes having bent flattened portions lanes between'said tubes and in contact with them.

13. In a heat exchange device, a casing, rows of tubes having bent flattened portions in said casing and bars extending'through lanes between said tubes and in contact with them, said bars lying in lanes parallel to the bent portions of said tubes.

incest? contact with them, said bars being located in different lanes at various points longitudinally of said tubes and serving to hold all of the tubes in alignment.

16. Ina heat exchange device made up of tubes placed in rows over and through which the heating and heated fluid fiows in a parallel direction to' the tubes, spacing strips placed between the tubes, said spacing strips being placed at difierent points alon the length of the tubes with a multiplicity 0 rows of tubes between any two adjacent spacing strips which come at the same position with respect to the length of the tubes, said spacing strips being made to come between all of the rows of tubes and to act as spacers for all of the tubes, thereby serving to hold all of the tubes in alignment.

- 17. In a heat exchange device, a casing,

tubes in said casing, the ends of said tubes being bent in opposite directions, and tube plates at oppositeends of said casing into which said bent ends enter at points spaced apart farther than the main portions of said tubes are spaced apart.

18. In a heat exchange device, a casing, tubes in said casing, the ends of said tubes being bent in opposite directions, the bent portions of said tubes differing in length and lying along arcs of non-concentric circles and the points where the bends in said tubes begin being inclined across said heat exchange device. I

1 DAVID S. JACOBUS.

in said casing and bars extending through 

